According to the Washington Post:

“The Republican-controlled Senate yesterday blocked a proposed constitutional amendment to bar same-sex marriage, effectively killing the White House-backed measure for the rest of this year and handing President Bush a big election-year defeat. The vote was 48 to 50 against bringing the initiative to a vote, 12 short of the 60 needed to limit debate and move toward final action on the amendment. It would have taken a two-thirds majority — 19 votes more than the GOP had yesterday — to pass the amendment itself.”

I guess it's dead for this year. I'm glad. Now we can move on to more important issues like getting Bush out of office.